I'm The Alpha's Assassin Mate

Two young and most feared Assassins , Bethany Lloyd along with her twin brother, Sebastian Lloyd, was sent by their master/uncle to assassinate the strongest wolf pack , the Shadow Moon pack's , Alpha , Randolph Stoner and his twin sister , Ramona Stoner .
When they were young , their parents were killed by something that was as large as a full grown horse with fur as dark as midnight , eyes as red as blood . Years later , their uncle found them . Ever since then , their uncle trained them as they are now , the youngest and most feared Assassins . People says that they killed with no mercy and have a heart like stone .
What happen if their targets turned out to be their mates ? Will they join them or kill them ? Will their mates cure their stone heart ? Mysteries unlocked as they find out they're no ordinary humans .........
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